spamassassin - in D - state

Setup is OpenSUSE 11 with ISPConfig 2.2.32 installed by the perfectserver howto. The only difference is that the filesystem is Reiser instead of EXT3.
After few hours, we are getting following situation:

EDIT: Just tried to change this user's shell to /bin/bash. No change - after sending mail to this user, spamassassin went into D-state. Just verified other user accounts - exactly the same behavior. Can anyone report similar situation?